题干

常温下,下列四种溶液:①0.1mol/LNH3•H2O,②0.1mol/L(NH42SO4③0.1mol/L NH4HSO4④0.1mol/LCH3COONH4,请根据要求填空:

(1)当盐酸与①等体积等浓度混合,混合溶液呈____(填“酸性、碱性、中性”)

(2)溶液②呈酸性的原因是(用离子方程式表示)____ ,且溶液中各离子浓度大小关系为 ____ ;

(3)实验测定溶液④的pH=7,则c(CH3COO____ c(NH4+)(填“>、<、=”);

(4)上述四种溶液中,pH最小的是(填序号____  ;

(5)上述四种溶液中,c(NH4+)由大到小的顺序为(填序号)____ ;

(6)将溶液①③混合,写出反应的离子方程式:____ .

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答案(点此获取答案解析)

\u9178\u6027,NH4++H2O\u21ccNH3\u2022H2O+H+,c\uff08NH4+\uff09\uff1ec\uff08SO42\ufe63\uff09\uff1ec\uff08H+\

同类题1

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    I loved my aunt Suzy. She was such a kind old lady. I loved going to her house on holiday. She had been sick for the last few years and, though my job had taken me away across the town, I tried to visit her as much as possible. I helped with the shopping, the cooking and the cleaning and taking her pet cat Mazy to the vet.

    Sad as her passing away was, what happened to Mazy was even more worrying. Because aunt Suzy had no children, there wasn't anyone who seemed to care for her beloved cat friend. I would have taken her in a short time, but my apartment doesn't allow pets. First, we talked with her neighbors. Mr. Jenkins, who was alone and lived across the street, wasn't interested. Joe and Sally who lived next door had a small child with serious skin allergies(过敏症). My aunt's best friend Molly who had lived just down the road was unable to take care of herself as she had serious health problems.

    Second, we thought about our family members. My brother Bobby and his wife Jill were eliminated at once as they aren't cat people. My cousin in California was a bit interested, but we weren't sure about the trip as Mazy was nearly as old as my aunt (in cat years!). Finally, we came to the local humane society to see whether they would be able to help her find a new home. The problem was that most people and families only welcomed a smart little cat into their home, not a dull old one.

    In the end, we had to put Mazy to sleep. I had spoken with the vet and realized it was possible for the best. It was so hard to lose aunt Suzy and then have nowhere for Mazy to live. A few months went by and I had gone to my aunt's house to clear out some of her belongings. I happened to see her mailman. Jerry and we started to talk about my aunt when he asked about Mazy. I told him that we had to put Mazy to sleep because we couldn't find a home for her. Jerry got really quiet. “I promised Suzy that if anything ever happened to her, I'd take care of Mazy”, he said sadly. “Suzy always said she'd told her lawyer the arrangement.”

    Hearing this, my heart sank to my feet and I almost cried. The saddest part, I realized, was this all could have been avoided. I guess we were just so busy in those final months that we didn't think about it. We could have called my aunt's lawyer to take care of it in less than 10 minutes. I'll never forgive myself for not thinking of it sooner. And I'll never forgive myself for losing Mazy.

同类题3

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    Plan on traveling around the USA this summer? If you need help in arranging the trip, or want ideas about where to go and what to do, there are a number of outstanding websites that can make your American dream come true.

http://byways.org

The National Scenic Byways Program covers 150 memorable roads. Some are natural routes, such as Route 1 along the California coast. Others focus on history (such as Route 6) or man-made attractions (the Las Vegas Strip). For each, you are provided with a map, told the route's length and how long is allowed, and given detailed suggestions on sights and stop-offs.

www.oyster.com

This is the best website for reviews of hotels in US cities and resorts. The reviews are impressively thorough, covering locations, rooms, cleanliness, food and so on. Importantly, these are not promotional photos by the hotels, but more honest and real ones taken by inspectors. Search facilities are excellent From the 243 hotels reviewed in the New York, you can narrow down what you are looking for by locations, facilities and styles, or just pick out a selection of the best.

www.101 usaholidays.co.uk

This is the latest offering that features 101 holiday ideas to the USA. It's an impressively diverse selection, ranging from touring in the footsteps of Martin Luther King to a golfing break in Arizona and a cycling and wine-tasting trip in California's Napa Valley. Narrow down what you are looking for — whether by price, region, theme and who will be traveling — and then just the photos of the relevant holidays remain on view. It's a really clever design.

www.mousesavers.com

Walt Disney World in California can make dreams come true, but the price is not affordable for the majority of people.

So turn to long established Mouscsavers.com, dedicated to giving big discounts on tickets, hotels and dining at Walt Disney World. The website also offers general money-saving tips, suggestions for cheap and free stuff and brief coverage of other Florida and California theme parks.